first divide it into 3 groups... 4 for each group...
) S4 _: t; K6 V# v) ~( `6 @5.39.217.77den use 2 groups to test... if the weight is same... den throw away these 2 groups.. if not... use another 1 group to test with tat 2 groups... throw away the same weight groups...公仔箱論壇3 z. q% u" g7 M* T$ A
den... left 4 balls...tvb now,tvbnow,bttvb2 a2 E/ l/ k6 T0 [! O- x
when u use tat 3 groups to test... u oredi know it is heavier or not...
7 s, I* x. m" C9 ctvb now,tvbnow,bttvbso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
9 h3 O% a2 P2 \3 j5.39.217.77take the heavier or lighter 1... throw away tat 2 normal ball...
% t: D1 j9 ?2 |, c; X( k$ R& ~den u juz nit 2 test the last 2 balls...
( `0 x# R! b$ G1 f& e* D! x6 jsame for now... take the heavier or lighter 1... |